/**
* dp转px
*/
public static int dp2px(Context context, float dpValue) {
    final float scale = context.getResources().getDisplayMetrics().density;
    return (int) (dpValue * scale + 0.5f);
}

/**
* px转dp
*/
public static int px2dp(Context context, float pxValue) {
    final float scale = context.getResources().getDisplayMetrics().density;
    return (int) (pxValue / scale + 0.5f);
}

/**
* sp转px
*/
public static int sp2px(Context context, float spValue) {
    final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
    return (int) (spValue * fontScale + 0.5f);
}

/**
* px转sp
*/
public static int px2sp(Context context, float pxValue) {
	final float fontScale = context.getResources().getDisplayMetrics().scaledDensity;
    return (int) (pxValue / fontScale + 0.5f);
}

/**
 * 各种单位转换
 * 该方法存在于TypedValue
 */
public static float applyDimension(int unit, float value, DisplayMetrics metrics) {
    switch (unit) {
        case TypedValue.COMPLEX_UNIT_PX:
            return value;
        case TypedValue.COMPLEX_UNIT_DIP:
            return value * metrics.density;
        case TypedValue.COMPLEX_UNIT_SP:
            return value * metrics.scaledDensity;
        case TypedValue.COMPLEX_UNIT_PT:
            return value * metrics.xdpi * (1.0f / 72);
        case TypedValue.COMPLEX_UNIT_IN:
            return value * metrics.xdpi;
        case TypedValue.COMPLEX_UNIT_MM:
            return value * metrics.xdpi * (1.0f / 25.4f);
    }
    return 0;
}

/**
 * 在onCreate()即可获取View的尺寸
 *
 * @return 返回数组的第0个是宽，第1个是高，不要越界哦
 */
public static int[] forceGetViewSize(View view) {
    int widthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
    int heightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
    view.measure(widthMeasureSpec, heightMeasureSpec);
    return new int[]{view.getMeasuredWidth(), view.getMeasuredHeight()};
}

/**
 * ListView中提前测量View尺寸，如headerView
 * 用的时候去掉注释拷贝到ListView中即可
 * 参照以下注释代码
 */
public static void measureViewInLV(View view) {
    Log.i("tips", "U should copy the follow code.");
    /*
    ViewGroup.LayoutParams p = view.getLayoutParams();
    if (p == null) {
        p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT);
    }
    int width = ViewGroup.getChildMeasureSpec(0, 0, p.width);
    int height;
    int tempHeight = p.height;
    if (tempHeight > 0) {
        height = MeasureSpec.makeMeasureSpec(tempHeight,
                MeasureSpec.EXACTLY);
    } else {
        height = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
    }
    view.measure(width, height);
    */
}